at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 428

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

428
AT91SAM9G20 Preliminary
Figure 31-18. TWI Read Operation with Single Data Byte without Internal Address
(CLDIV, CHDIV, CKDIV) in TWI_CWGR
Read Receive Holding Register
Set the Master Mode register:
TWI_CR = MSEN + SVDIS
TWI_CR = START | STOP
Read ==> bit MREAD = 1
Set the Control register:
- Device slave address
- Transfer direction bit
Read Status register
Read status register
(Needed only once)
Start the transfer
- Master enable
Yes
TXCOMP = 1?
Yes
Set TWI clock
RXRDY = 1?
BEGIN
END
No
No
6384B–ATARM–15-Dec-08